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Cheap flights from St. Louis to Sofia from $349

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 7/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
4:05 pm - 6:10 pm
STL
-
SOF
18h 05m
2 stops
United Airlines Logo
2:05 pm - 11:09 pm
SOF
-
STL
17h 04m
2 stops
$861United Airlines
Wed, Dec 16 - Fri, Dec 25
United Airlines Logo
4:15 pm - 6:10 pm
STL
-
SOF
17h 55m
2 stops
United Airlines Logo
2:05 pm - 11:09 pm
SOF
-
STL
17h 04m
2 stops
$862United Airlines
Wed, Dec 16 - Fri, Dec 25
Lufthansa Logo
12:59 pm - 12:10 pm
STL
-
SOF
15h 11m
2 stops
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$863Lufthansa
Wed, Sep 9 - Wed, Sep 16
Lufthansa Logo
3:40 pm - 6:10 pm
STL
-
SOF
18h 30m
1 stop
Lufthansa Logo
2:05 pm - 11:09 pm
SOF
-
STL
17h 04m
2 stops
$870Lufthansa
Wed, Dec 16 - Fri, Dec 25
Lufthansa Logo
12:59 pm - 12:10 pm
STL
-
SOF
15h 11m
2 stops
Lufthansa Logo
6:10 am - 3:38 pm
SOF
-
STL
17h 28m
2 stops
$871Lufthansa
Wed, Sep 9 - Wed, Sep 16
Multiple Airlines Logo
4:05 pm - 3:15 pm
STL
-
SOF
15h 10m
2 stops
Multiple Airlines Logo
2:05 pm - 11:09 pm
SOF
-
STL
17h 04m
2 stops
$872Multiple Airlines
Wed, Dec 16 - Fri, Dec 25
Multiple Airlines Logo
4:05 pm - 3:15 pm
STL
-
SOF
15h 10m
2 stops
Multiple Airlines Logo
2:05 pm - 11:09 pm
SOF
-
STL
17h 04m
2 stops
$873Multiple Airlines
Wed, Dec 16 - Fri, Dec 25
Lufthansa Logo
3:40 pm - 6:10 pm
STL
-
SOF
18h 30m
1 stop
Lufthansa Logo
2:05 pm - 11:09 pm
SOF
-
STL
17h 04m
2 stops
$875Lufthansa
Wed, Dec 16 - Fri, Dec 25
Lufthansa Logo
3:40 pm - 6:10 pm
STL
-
SOF
18h 30m
1 stop
Lufthansa Logo
2:05 pm - 11:09 pm
SOF
-
STL
17h 04m
2 stops
$876Lufthansa
Wed, Dec 16 - Fri, Dec 25
United Airlines Logo
4:40 pm - 11:15 pm
STL
-
SOF
22h 35m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$881United Airlines
Wed, Sep 9 - Wed, Sep 16

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United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets
United Airlines
Dec 16
STL4:05 pmLambert-St Louis
18h 05m
2 stops
SOF6:10 pmSofia
Dec 25
SOF2:05 pmSofia
17h 04m
2 stops
STL11:09 pmLambert-St Louis
$861
United Airlines
Sep 9
STL4:40 pmLambert-St Louis
22h 35m
2 stops
SOF11:15 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$881
United Airlines
Sep 9
STL4:40 pmLambert-St Louis
18h 00m
2 stops
SOF6:40 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$882

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets
Lufthansa
Sep 9
STL3:30 pmLambert-St Louis
18h 35m
1 stop
SOF6:05 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$862
Lufthansa
Sep 9
STL12:59 pmLambert-St Louis
15h 11m
2 stops
SOF12:10 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$863
Lufthansa
Dec 16
STL3:40 pmLambert-St Louis
18h 30m
1 stop
SOF6:10 pmSofia
Dec 25
SOF2:05 pmSofia
17h 04m
2 stops
STL11:09 pmLambert-St Louis
$870

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated June 28, 2026.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/16

4:05 pm-6:10 pm

2 stops18h 05m

Sofia

Fri 12/25

2:05 pm-11:09 pm

2 stops17h 04m

$861

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/16

4:15 pm-6:10 pm

2 stops17h 55m

Sofia

Fri 12/25

2:05 pm-11:09 pm

2 stops17h 04m

$862
Quickest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:59 pm-12:10 pm

2 stops15h 11m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$863

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/16

3:40 pm-6:10 pm

1 stop18h 30m

Sofia

Fri 12/25

2:05 pm-11:09 pm

2 stops17h 04m

$870

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:59 pm-12:10 pm

2 stops15h 11m

Sofia

Wed 9/16

6:10 am-3:38 pm

2 stops17h 28m

$871

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/16

4:05 pm-3:15 pm

2 stops15h 10m

Sofia

Fri 12/25

2:05 pm-11:09 pm

2 stops17h 04m

$872

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/16

4:05 pm-3:15 pm

2 stops15h 10m

Sofia

Fri 12/25

2:05 pm-11:09 pm

2 stops17h 04m

$873

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/16

3:40 pm-6:10 pm

1 stop18h 30m

Sofia

Fri 12/25

2:05 pm-11:09 pm

2 stops17h 04m

$875

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 12/16

3:40 pm-6:10 pm

1 stop18h 30m

Sofia

Fri 12/25

2:05 pm-11:09 pm

2 stops17h 04m

$876

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

4:40 pm-11:15 pm

2 stops22h 35m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$881

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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2

See travel insights to Sofia from

How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from St. Louis is in October. Flight prices, which tend to average around $0, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from St. Louis during January instead. Flights to Sofia in January, while not as cheap as those in October, still average around $528.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

18h 00m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 18h 00m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

Frequently asked questions about flying from St. Louis to Sofia

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 18h 00m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $559Free CancellationRating
7.4
9,898 reviews
Search United Airlines flights
LufthansaPriceFrom $567Free CancellationRating
6.8
8,103 reviews
Search Lufthansa flights
Air CanadaPriceFrom $1,108Free CancellationRating
7.1
11,269 reviews
Search Air Canada flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Lufthansa
United Airlines
Air Canada